Deep Cleaning Severely Neglected Stone

Deep Cleaning Severely Neglected Stone

September 2, 2018 Off By Torin Dixon

Cleaning Sandstone

by Torin Dixon

Several Years Ago I wrote about this project in Missoula Montana, how the metal roof flashing was installed wrong, causing rain water to drain over the face of these beautiful Sandstone walls. See link HERE

Recently, I was asked to perform a “test cleaning” to determine how difficult it would be to clean the sandstone, as there has been extensive staining and deterioration. See recent image below:

Dirty Sandstone Wall Before Cleaning

cleaning sandstone with HMK R155 Intensive Cleaner

Interestingly, the light areas surrounding each panel were areas that the original impregnating sealer had been applied, and was still protecting the stone. The original stone sealer was the HMK S231 Silane Impregnator.

As you can see, the sandstone has extensive staining from 15 years of rainwater draining over the surface. We pretreated the area with HMK R155 Intensive Cleaner and allowed the cleaner to activate for 15 minutes. After the dwell/activation time, I scrubbed the area with a nylon scrub brush, then lightly pressure washed the area. The results were remarkable after only one application. Please see after image and following video:

cleaned sandstone wall panels

Video showing Before & After Cleaning Sandstone

If you have a stone cleaning question, please call our Stone Care Experts  at 800-380-6881, or email us:

The Dixons StoneCareOnline is owned and by Torin & Diane Dixon. Torin is a dimensional stone fabricator and installation contractor, and has extensive knowledge of Stone Quarrying, Fabrication, Installation, and Maintenance. Diane is in the office to assist clients with selecting the proper products to Clean, Protect, and Maintain all types if Natural Stone.